Engine valve mechanism.



`I'I. E. COFFIN.

ENGINE vALvYEJMEcImNIsM. APPLICATION FILED 0CT. 5 I9II. IIIENEWED FEB.5| |915.

1,186,104. Patented Apr. 20, 1915.

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UNITED suTArss PATENT onirica.

HOWARD Il.v COFFIN, 0F DETROIT, MICHIGAN,

ASS-IGNOR, BY MESNE ASSIGNMENTS, T0

THE DETROIT MOTOR & MACHINE COMPANY, 0F DETROIT, MXCHIGAN, A COREORATIoN or MICHIGAN.

ENGINE VALVE MECHANISM.

Specification of Letters Patent.

Patented Apr. 20, 1915.

Application led October 6, 1911, Serial No. 653,197. Renewed February 6,1915. Serial No. 6,637.

To all whom it' may concern.'

Be it known that "I, HOWARD E. C oFrIN, a citizen of the United Statesof America, residn at Detroit, in the county of l/Vayne and ate ofMichigamlhave invented certain new and useful Improvements in En gineValve Mechanism, of which the follow ing is a specication, referencebeing had therein to the accompanying drawings.

The invention relates to engine valve mechanism of that type in which arotary disk valve is-arranged to control the inlet and exhaust ports ofthe cylinder and is eatd on the inner face\ of the cylinder It is theobject 'of the invention to over come certain defects in construction ofthe type heretofore used, to simplify the construction, and to providemeans of adjustment whereby the parts may at all times bc maintained inoperative condition.

The invention therefore consists in vari ous features of construction ashereinafter set forthr In the drawings-Figure 1 is a cross sec tionthrough the upper portion of one of 'the engine cylinders showing thearrange ment of the valv`e-mechanism therein; Figf 2 is a lon itudinalsection' therethrough slightly n10 ified; and Fig. 3 is a plan view ofthe adjustment means Vfor the valves.`

My improvementsv are designed with particular reference to an internalcombustion engine in which the rotary disk is alternately subjected tothe pressure of explosion and to a pressure less than atmosphere uponthe suction stroke. 'This change 1n pressure tends to pound the valveupon its seat which is detrimental to the face thereof and also producesnoise.

With my improved construction this objection is overcome and thevariation in pressure is utilized for a useful functionl as will behereinafter described.

A is the engine cylinder provded with the usual surrounding Water JacketB.

C is the cylinder head prcferablj. detach able from the cylinder bodyand l" is a ported rotary valve seated on tfo meer face of the head andcontr ne' fav ports therein. The dish D is prvtwialy of greater diameterthan ll; what-r bore and is located in i: recess gnetwczlw, .formen inthe head C.

E is the strm of 'the relai; 'h' passes outward. through a journalbearing in the head, andi? is a gear wheel secured to the outer end ofthe stein and forming the driver therefor. 4

lt is ver essential to the successful oper'- ation of t e engine andlife of the valve. that the latter should rfftate ahim; an axis at alltimes perpenriicui .r 'to its sont. n lt has been found hol-.fe er.; tla where the valve is driven through th ucm ci the .gear Wheel at theouter" l oi' the slemfwthe thrust of the inierineshing drive gearl willcause an unequal 'rolling of tlle journal hearing and eventually a tihngof the valve stem and disk. This will cause the peripheral portion ofthe valve to cr-ulact with the seat and will soon wear the face so thatthe valve will leak.V

One of the improved features of my con struction is an arrangement bywhich the valve stem. is always held perpendicular to the seat and thisis accomplished. first. by the use of a hardened anti-friction hearingfor the outer end cl the stem the roll of vvhich is too slight te'permit ang-ul nient ci? theaxis; second, by arrangidg bearing as nearlyas p-z i )lo in direct liuc with the thrust from. the rrile greet'.

designed to take care of both the radial and' end thrust. This bearing(l may he located at the upper .end of the stem E, as shown in Fig. l,but is preferably located as in Fig. 2 in a recess in't'ne upper facevofthe head C and the gear wheel l? has its hub portion olf-set so thatthe gear teeth are in plane of the bearing.

To hold the valve disk to its seat, longitudinal movement of the stem isprevent ed by the end thrust hearing preferably the hub of the gearWheel l hears against the end of the revoluble race G' of the hearing'G, which is groovell to engage enlargements on the rolls G3. said.enlargements also eliW gagging corrcspondina; grooves in the non*revoluble race il?. The huh of the gear Wheel is longitudinallyadjustable upon the stem preferably by threading the upper end' of thelatter as at li and providing a nut I.

This nut is locked by suitable means suoli and. engageant threadedaperture in the hub 11G of the gva? Wheel. Thus Whvn the adjueod indrmvthu .l2i- *m iis pate J will prevent @hangs en ad 7h/Qn howeml, itis; m- 'Y Slighs: Wei* ihf Smew J" and. thv phat@ th: :LH of theSvgmnnt, m: if z muy be c, nuage@ in i? Y hxagmazll nut m p "uuic arthurau L ment. Thus hu n. h may o? :muur-:ivd t- .Y seat to great meaty :md,nfy mccnt clcaranu@ is alowed tu receive the necusary thckwss of oil m.

For multi-cylinder constructions the head for the several eyhndm tii'cgm and :ri-KE, Us" n u Steun; and dz'iw gezins um uw, 1mi dan TimEems F m'jm mm l whhe rat um vm nl :i u @Vim Quai* uw 'in' Lion with theThe gm; fifs casses m una l' (irai imm i, space. 'Y

j' sea t to a, in@

CESA.

@aid

hvfmn the vulve :md its Senf., un anti friction Llmzsi rfmlmg; "foroppnsmg n'mwffwut of i "sm its Sent.. and wrm-ms 10- a rotary for saidvalve passing through said sent, n driver for said vulve secured to theouter 0nd of said stein, an anti-friction hearing for 'sustaining theradial und end thrust of said stem, und n'ieuns copemting with the endthrust bearing for limiting the clearance between the vulve and itsseat.

. 8. The combination with an engine eylinder and the head therefor, of arotury dish valve seated -on the inner face of Suid heud, a' stein forsaid Valve passing centrally out through said head, un nnti-frigtionjournul bearing for the outer end of Suid stein sented in a recess insaid head, u drive `heel mounted on said stein adjacent to Suid :intrfriction bearing, un end thrust bearing for opposing movement of seidvulve from its seat, and means for adjusting the elem-unse between thevalve and its sont.

9, The combination with un engine eylin der und the head thereof, of arotary .disk valve seated on the inner face of Suid head,- a stem forand salve passing outward through Suid head, a radial und end thrustbearing for said stem in said heud, a drive vwheel mounted on said steinthrough which the end thrust is transmitted to said been ing, und ineensut the end nl Suid stein for adjusting 'huid drive wheel in linutthecleurance between the. vulve und sent.

ll). The combination with :en engine cylinder luiring n ported will, nl:i rotary vulve engaging Suid sent, u steen 'for will vulve passingcenti-:illy through -iid sont, :1 driv ing' Wheel lor Suid vulveeonnwted 'uith the outer und nl' Suid lStein, und :in zitil'ifi'i 'tionjournal beuringg for amid stein, nid driving .wheel linvinpj its hubportion eli'ant und s:\id enti-trillion bearing` being ponitioncd withinmid olffrt portion.

ll. The combination with :in engine cylA inder inning u porti-,d vulvesent, of :i rotary disk vulve enga mid sont, :i lteni ior smid vulve, un:inl-Ali ieiion journal huur ing for Suid stein, und u tiuitheil genwlnil having' its huh portion oll'sit .en thnt flu-.geur teeth :ire inthe plaine of Suid befiringr.

In teetinion)v whereof l nliix in v signature in presence of two\\'itnes-;ses.

HOWARD 1C. (OFIFIN.

Vitnesses LENA M. CAnLn, NINA L. BAnSn.

